EP3442148A1 - Bandbreitenteilanpassung in downlink-kommunikation - Google Patents

Bandbreitenteilanpassung in downlink-kommunikation Download PDF

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Publication number
EP3442148A1
EP3442148A1 EP17186074.5A EP17186074A EP3442148A1 EP 3442148 A1 EP3442148 A1 EP 3442148A1 EP 17186074 A EP17186074 A EP 17186074A EP 3442148 A1 EP3442148 A1 EP 3442148A1
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EP
European Patent Office
Prior art keywords
bandwidth part
during
bandwidth
duration
drx cycle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17186074.5A
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English (en)
French (fr)
Inventor
Quan KUANG
Hidetoshi Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Corp of America
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Panasonic Intellectual Property Corp of America
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Publication date
Application filed by Panasonic Intellectual Property Corp of America filed Critical Panasonic Intellectual Property Corp of America
Priority to EP17186074.5A priority Critical patent/EP3442148A1/de
Priority to PCT/EP2018/071653 priority patent/WO2019030335A1/en
Priority to ES18749401T priority patent/ES2945965T3/es
Priority to PL18749401.8T priority patent/PL3665822T3/pl
Priority to BR112020002544-5A priority patent/BR112020002544A2/pt
Priority to MX2020001617A priority patent/MX2020001617A/es
Priority to KR1020207007029A priority patent/KR102501220B1/ko
Priority to CN202210857915.9A priority patent/CN115412215B/zh
Priority to RU2020103886A priority patent/RU2763778C2/ru
Priority to JP2020503744A priority patent/JP7378387B2/ja
Priority to EP22213581.6A priority patent/EP4175214A1/de
Priority to EP18749401.8A priority patent/EP3665822B1/de
Priority to CA3071213A priority patent/CA3071213A1/en
Priority to CN201880052155.6A priority patent/CN111034102B/zh
Publication of EP3442148A1 publication Critical patent/EP3442148A1/de
Priority to CONC2020/0001172A priority patent/CO2020001172A2/es
Priority to US16/786,746 priority patent/US11265961B2/en
Priority to US17/579,493 priority patent/US11659618B2/en
Priority to US18/299,465 priority patent/US12022561B2/en
Priority to US18/673,129 priority patent/US20240324064A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/231—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to the adaptation of bandwidth parts in a mobile communication system to be utilized in combination with discontinuous reception for downlink communications between a mobile terminal and a base station.
  • next generation cellular technology which is also called fifth generation (5G).
  • NR 5G new radio
  • 3GPP TSG RAN TR 38.913 v14.1.0 "Study on Scenarios and Requirements for Next Generation Access Technologies", Dec. 2016 (available at www.3gpp.org and incorporated herein in its entirety by reference), at least including enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), massive machine type communication (mMTC).
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency communications
  • mMTC massive machine type communication
  • eMBB deployment scenarios may include indoor hotspot, dense urban, rural, urban macro and high speed;
  • URLLC deployment scenarios may include industrial control systems, mobile health care (remote monitoring, diagnosis and treatment), real time control of vehicles, wide area monitoring and control systems for smart grids;
  • mMTC may include the scenarios with large number of devices with non-time critical data transfers such as smart wearables and sensor networks.
  • LTE Long Term Evolution
  • the fundamental physical layer signal waveform will be based on Orthogonal Frequency Division Multiplexing (OFDM).
  • OFDM Orthogonal Frequency Division Multiplexing
  • CP-OFDM OFDM with cyclic prefix
  • DFT-S-OFDM Discrete Fourier Transformation
  • DFT-S-OFDM Discrete Fourier Transformation
  • One of the design targets in NR is to utilize the fundamental physical layer signal waveform in communications while reducing the overall power consumption.
  • DRX discontinuous reception
  • downlink refers to communication from a higher node to a lower node (e.g. from a base station to a relay node or to a UE, from a relay node to a UE, or the like).
  • uplink refers to communication from a lower node to the higher node (e.g. from a UE to a relay node or to a base station, from a relay node to a base station, or the like).
  • sidelink refers to communication between nodes at the same level (e.g. between two UEs, or between two relay nodes, or between two base stations).
  • One non-limiting and exemplary embodiment facilitates adaptation of bandwidth parts in a mobile communication system to be utilized in combination with discontinuous reception for downlink communications between a mobile terminal and a base station.
  • the techniques disclosed here feature, a mobile terminal for communicating in a mobile communication system with a base station using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2. Both, the first and second bandwidth part BP1 and BP2 are within a system bandwidth, wherein the first bandwidth part, BP1, is smaller than the second bandwidth part, BP2.
  • the mobile terminal comprises a transceiver which, in operation, receives a configuration of a discontinuous reception, DRX, cycle.
  • the mobile terminal comprises a processor which, in operation, configures, upon reception of the configuration of the DRX cycle, the a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part, BP1, and the second bandwidth part, BP2.
  • the techniques disclosed here feature a base station for communicating in a mobile communication system with a mobile terminal, using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2. Both, the first and second bandwidth part BP1 and BP2 are within a system bandwidth, wherein the first bandwidth part, BP1, is smaller than the second bandwidth part, BP2.
  • the base station comprises a transceiver which, in operation, transmits a configuration of a discontinuous reception, DRX, cycle.
  • the base station comprises a processor which, in operation, configures, upon transmission of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part, BP1, and the second bandwidth part, BP2.
  • the techniques disclosed here feature an operating method to be performed by a mobile terminal using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2, within a system bandwidth, the first bandwidth part, BP1, being smaller than the second bandwidth part, BP2.
  • the operating method comprises the steps of receiving a configuration of a discontinuous reception, DRX, cycle; and configuring, upon reception of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part BP1 and the second bandwidth part BP2.
  • the techniques disclosed here feature an operating method to be performed by a base station using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2, within a system bandwidth, the first bandwidth part, BP1, being smaller than the second bandwidth part, BP2.
  • the operating method comprises the steps of transmitting a configuration of a discontinuous reception, DRX, cycle; and configuring, upon transmission of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part BP1, and the second bandwidth part BP2.
  • NR should aim for even further reduced power consumption, as compared with LTE.
  • NR should allow a UE to operate in a way where it receives at least downlink control information in a first RF bandwidth and where the UE is not expected to receive in a second RF bandwidth that is larger than the first RF bandwidth within less than X ⁇ s (the value of X did remain for further study, FFS).
  • the UE is not required to receive any DL signals outside a frequency range A which is configured to the UE.
  • the interruption time needed for frequency range change from frequency range A to a frequency range B needs to be defined (TBD). Additionally, the frequency ranges A & B may be different in BW and center frequency in a single carrier operation.
  • a bandwidth part consists of a group of contiguous physical resource blocks (PRBs). Reserved resources can be configured within the bandwidth part.
  • PRBs physical resource blocks
  • the bandwidth of a bandwidth part equals to or is smaller than the maximal bandwidth capability supported by a UE.
  • the bandwidth of a bandwidth part is at least as large as the synchronization signal (SS) block bandwidth.
  • the bandwidth part may or may not contain the SS block.
  • the bandwidth part (BP) adaptation for power saving relies on a following configuration: At least two downlink BPs are semi-statically configured for a given UE, one is narrowband, and the other is wideband. Narrowband BP can be activated for the UE if traffic is low. As a result, reception over a narrower bandwidth can provide power saving gain for the UE. A wideband BP can be activated for the UE if the traffic is high, in order to boost the data rate.
  • FIGs. 1a- 1d Different examples of downlink communications are depicted in Figs. 1a- 1d utilizing the DRX framework in NR. Particularly, all the Figs. 1a- 1d show a downlink communication in NR between a base station (also referred to as gNodeB or gNB) and a mobile terminal (also referred to as UE). So despite the necessity to also perform uplink communication between the mobile terminal and the base station, this has been omitted in the figures and description for conciseness reasons only.
  • a base station also referred to as gNodeB or gNB
  • UE mobile terminal
  • a DRX cycle consists of an "ON duration" during which the UE should monitor the physical downlink control channel and a "DRX period" during which the UE can skip reception of downlink channels for battery saving purposes.
  • the parameterization of the DRX cycle involves a trade-off between battery saving and latency.
  • a long DRX period is beneficial for lengthening the UE's battery life. For example, in case of short bursts of traffic demands, it is usually a waste of resources for the UE to continuously monitor downlink channels while there is no traffic to meet the supply.
  • a short DRX period is better for faster response when data transfers resumed.
  • a UE may be configured with a long DRX cycle and a short DRX cycle and the transition between the two DRX cycles may be either controlled by a timer or by explicit commands from the gNodeB.
  • the gNodeB may configure the UE to transition to continuous reception, thereby setting the "ON duration" to the maximum and "DRX period" to zero.
  • the configuration of a DRX cycle involves at least three timers, namely the "on duration” timer, the "inactivity” timer and the “retransmission” timer.
  • the individual monitoring durations for the UE are specified, namely the transmission period for the gNodeB to transmit data and/or control signals to the UE, the inactive period which is trailing a transmission to the UE, and retransmission period(s) which would enable retransmissions in case of communication failures.
  • the at least three timers determine for a DRX cycle the time when the UE has to monitor the downlink from the gNodeB, while for the remaining time it can assume a power saving state.
  • the gNodeB controls the UE to repeat the DRX cycle or it controls the UE to transits to a different long/short DRX cycle, or even to continuous reception. The control is facilitated by a timer or by explicit commands as discussed before.
  • one scheduling interval corresponds to one transmission time interval (TTI) in MAC layer which is defined using number of symbols.
  • TTI transmission time interval
  • Different TTI durations therefore have different numbers of symbols, e.g. corresponding to a mini-slot, one slot, or multiple slots in one transmission direction.
  • Fig. 1a an example of two consecutive DRX cycles #N and #N+1 is shown with no downlink data transmissions from the gNodeB to the UE. Irrespective thereof, for both DRX cycles the UE is configured with a "ON duration" timer with a timer value of 2 slots. Thus, the UE wakes up during time slots #0 and #1 of both DRX cycles #N and #N+1 to monitor the physical downlink control channel for potential downlink assignment.
  • the UE monitors (at least) as long as the "ON duration" timer is running the physical downlink control channel (PDCCH) for scheduling assignments (downlink resource allocations), namely for downlink control information (DCI) messages with a resource block (RB) assignment and a new data indicator (NDI) where the CRC is scrambled with the UE identity (i.e. a radio network temporary identifier (RNTI) of the UE, particularly the cell radio network temporary identifier (C-RNTI) of the UE).
  • RNTI radio network temporary identifier
  • C-RNTI cell radio network temporary identifier
  • the UE Having monitored the physical downlink control channel and having detected no downlink assignments for the UE, it goes in slot #2 back to sleep and continues to sleep for the remaining part of the DRX cycle #N. In other words, the UE is in a DRX period from slot #2 to slot #19 of DRX cycle #N. Thereby, the power consumption for the downlink communication can be reduced in the UE during DRX cycle #N.
  • the "inactive" duration and the "retransmission" duration are not set off due to the absence of any downlink assignments and downlink transmissions. Since there is no detected downlink assignment and there is no received downlink transmission, the UE would not set off or. reset the INACTIVE timer. Additionally, in the absence of any downlink data transmissions, there could not be any communication failures that would require setting off or starting the RETRANSMISSION timer.
  • Fig. 1b an example of two consecutive DRX cycles #N and #N+1 is shown with downlink data transmissions from the gNodeB to the UE in DRX cycle #N and with no downlink data transmissions in DRX cycle #N+1.
  • the UE is configured with an "ON duration" timer with the value of 2.
  • the UE wakes up (at least) during time slots #0 and #1 of both DRX cycles #N and N+1 to monitor the physical downlink control channel for potential downlink assignments.
  • the UE wakes up in slot #0 and monitors the physical downlink control channel. In this slot #0 the UE does not detect a downlink assignment for the UE, which however changes for slots #1- #3.
  • a scheduling assignment in the physical downlink control channel (e.g. downlink control information (DCI) message which includes a RB assignment for an initial transmission) for the UE, it refers to the resource block(s) (RBs) indicated by the scheduling assignment in the physical downlink shared channel (PDSCH) and refers to the downlink data transmission in the indicated resource block(s).
  • DCI downlink control information
  • the UE receives the scheduled downlink data transmission. Having received a downlink data transmission, the UE resets the INACTIVE timer.
  • the UE detects a downlink assignment in the physical downlink control channel which schedules a downlink data transmission in the same slots #2 and #3, respectively.
  • the UE receives the scheduled downlink data transmission, and the UE resets, in each of these slots #2 and #3 the INACTIVE timer. Accordingly, in slot #3, the INACTIVE timer is still at its reset value, i.e. at the value of 3 slots.
  • the short "ON duration" period of 2 slots does not limit the downlink data transmission to these two slots only. Rather, having been scheduled with a data transmission during a slot within the "ON duration” period, the UE does reset the INACTIVE timer. During this time INACTIVE period, the UE remains monitoring the physical downlink control channel for further downlink assignments.
  • the TRANSMISSION duration extends from slot #0 to slot #3, hence encompasses the period where the "ON duration" timer is running but is not restricted in this respect. Rather, the TRANSMISSION duration shall be understood, in the context of the present disclosure, as time period which includes contiguous downlink data transmissions which have started while the "ON duration" timer is running but are not limited in this respect.
  • slot #4 is considered part of the INACTIVE duration.
  • slot #7 the INACTIVE timer has expired such that UE goes to sleep. Also in slot #8 the UE is sleeping and does not monitor the physical downlink control channel.
  • the UE needs to wake-up for potential retransmissions during a RETRANSMISSION duration which is provided for should one of the (initial) downlink data transmissions have failed.
  • the RETRANSMISSION duration is separately configured for each (initial) downlink data transmission, e.g. per hybrid Automatic Repeat Request (HARQ) process.
  • HARQ hybrid Automatic Repeat Request
  • RETRANSMISSION duration is aligned with the initial transmission in slot #1 e.g. starts at a predetermined offset, in this example 8 slots.
  • the RETRANSMISSION duration starts at slot #9 for the initial downlink data transmission in slot #1 and continues as long as the RETRANSMISSION timer is running. It terminates earlier if the UE has received the according downlink data retransmission.
  • the UE monitors during the RETRANSMISSION period the physical downlink control channel (PDCCH) for scheduling assignments, namely for downlink control information (DCI) messages with a resource block (RB) assignment and no new data indicator (NDI) but am indication of the corresponding HARQ process, where again the CRC is scrambled with the UE identity (i.e. a radio network temporary identifier (RNTI) of the UE, particularly the cell radio network temporary identifier (C-RNTI) of the UE).
  • PDCCH physical downlink control channel
  • DCI downlink control information
  • RB resource block
  • NDI no new data indicator
  • a scheduling assignment (e.g. a downlink control information (DCI) message which includes a RB assignment for the retransmission) for the UE, it refers to the resource block(s) (RBs) indicated by the scheduling assignment in the physical downlink shared channel (PDSCH) and receives the downlink data retransmission in the indicated resource block(s) in slot #11.
  • DCI downlink control information
  • the downlink data retransmission does not set off any INACTIVE duration.
  • the UE Since the downlink data retransmission has been received in slot #11, the UE goes in slot #12 back to sleep and continues to sleep for the remaining part of DRX cycle #N. In other words, the UE is in a DRX period from slot #12 to slot #19 of the DRX cycle #N. Same behavior of the UE going to sleep would have occurred in case the UE would not have not received a downlink data retransmission, but instead the RETRANSMISSION timer has elapsed. Also hereby, the power consumption for the downlink communication can be reduced in the UE during DRX cycle #N.
  • FIG. 1c an example of two consecutive DRX cycles #N and #N+1 is shown with downlink data transmissions from the gNodeB to the UE in DRX cycle #N and with no downlink data transmissions in DRX cycle #N+1.
  • the shown example of Fig. 1c is very similar to the example in Fig. 1b , however, with the difference, that downlink data transmissions are received not only in slots #1- #3 but in slots #1- #6.
  • the INACTIVE duration after the (initial) downlink data transmissions overlaps with a RETRANSMISSION duration separately configured for each (initial) downlink data transmission, e.g. per hybrid Automatic Repeat Request (HARQ) process.
  • HARQ hybrid Automatic Repeat Request
  • only a single RETRANSMISSION duration is shown, namely the one for the (initial) transmission in slot#1.
  • the UEs operation during the RETRANSMISSION duration can coexist with over the behavior during the INACTIVE duration.
  • the UE wakes up in slot #0 and monitors the physical downlink control channel. In this slot #0 the UE does not detect a downlink assignment for the UE, which however changes for slots #1- #6. In each of the slots #1- #6, the UE detects downlink assignments in the physical downlink control channel which schedule a downlink data transmission in the same slots #1 - #6, respectively.
  • the UE receives the scheduled downlink data transmission, and the UE resets, in each of these slots #1- #6 the INACTIVE timer. Accordingly, in slot #6, the INACTIVE timer is still at its reset value, i.e. at the value of 3 slots.
  • slot #7 is considered part of the INACTIVE duration.
  • the UE needs to wake-up for potential retransmissions during a RETRANSMISSION duration which is provided for should one of the (initial) downlink data transmissions have failed.
  • the RETRANSMISSION duration is separately configured for each (initial) downlink data transmission, e.g. per hybrid Automatic Repeat Request (HARQ) process.
  • HARQ hybrid Automatic Repeat Request
  • RETRANSMISSION duration is shown, namely the one for the (initial) transmission in slot #1, and starts at a predetermined offset, corresponding to slot #9. From this slot onward, the RETRANSMISSION duration is shown for slots #9- #11.
  • slot #9 the INACTIVE timer has not expired such that, for this reason alone, the UE monitors the physical downlink control channel.
  • slots #9 also belongs to the RETRANSMISSION period, the UE also monitors the physical downlink control channel for potential downlink data retransmissions.
  • the UE detects a scheduling assignment and, in the same slot #11 receives the corresponding downlink data retransmission. Since the downlink data retransmission has been received in slot #11, the UE goes in slot #12 back to sleep and continues to sleep for the remaining part of DRX cycle #N. Also hereby, the power consumption for the downlink communication can be reduced in the UE during DRX cycle #N.
  • FIG. 1d an example of two consecutive DRX cycles #N and #N+1 is shown with downlink data transmissions from the gNodeB to the UE in DRX cycle #N and with no downlink data transmissions in DRX cycle #N+1.
  • the shown example of Fig. 1d is very similar to the examples in Figs. 1b and 1c , however, with the difference, that downlink data transmissions are received in slots #1- #8.
  • the INACTIVE duration after the (initial) downlink data transmissions coincides with a RETRANSMISSION duration separately configured for each (initial) downlink data transmission, e.g. per hybrid Automatic Repeat Request (HARQ) process.
  • HARQ hybrid Automatic Repeat Request
  • only a single RETRANSMISSION duration is shown, namely the one for the (initial) transmission in slot#1.
  • the mobile terminal 210 is for communicating in a mobile communication system with a base station 260 using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2. Both, the first and second bandwidth part BP1 and BP2 are within a system bandwidth, wherein the first bandwidth part, BP1, is smaller than the second bandwidth part, BP2.
  • the mobile terminal 210 comprises a transceiver 220 which, in operation, receives a configuration of a discontinuous reception, DRX, cycle.
  • the mobile terminal 210 comprises a processor 230 which, in operation, configures, upon reception of the configuration of the DRX cycle, the a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part, (BP1), and the second bandwidth part, BP2.
  • BP1 first bandwidth part
  • BP2 second bandwidth part
  • the base station 260 is for communicating in a mobile communication system with a mobile terminal 210, using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2. Both, the first and second bandwidth part BP1 and BP2 are within a system bandwidth, wherein the first bandwidth part, BP1, is smaller than the second bandwidth part, BP2.
  • the base station 260 comprises a transceiver 270 which, in operation, transmits a configuration of a discontinuous reception, DRX, cycle.
  • the base station 260 comprises a processor 280 which, in operation, configures, upon transmission of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part, BP1, and the second bandwidth part, BP2.
  • a operating method to be performed by a mobile terminal using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2, within a system bandwidth, the first bandwidth part, BP1, being smaller than the second bandwidth part, BP2.
  • the operating method comprises the steps of receiving a configuration of a discontinuous reception, DRX, cycle; and configuring, upon reception of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part BP1 and the second bandwidth part BP2.
  • a operating method to be performed by a base station using at least one of a first bandwidth part, BP1, and a second bandwidth part, BP2, within a system bandwidth, the first bandwidth part, BP1, being smaller than the second bandwidth part, BP2.
  • the operating method comprises the steps of transmitting a configuration of a discontinuous reception, DRX, cycle; and configuring, upon transmission of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part BP1, and the second bandwidth part BP2.
  • a mobile terminal also referred to as UE
  • a base station also referred to as gNodeB or gNB
  • a downlink communication between the gNodeB and the UE is to occur during at least one of the communication periods specified in a discontinuous reception, DRX, cycle.
  • a DRX cycle includes different communication periods, for example the TRANSMISSION period, the INACTIVE period, and the RETRANSMISSION period. During all these periods of the DRX cycle, the UE is required to at least monitor the physical downlink control channel for potential downlink communication. At the same time, the DRX cycle also includes no-communication periods, which may also referred to as DRX period(s). During these no-communication periods the UE can skip reception of downlink channels for battery saving purposes.
  • the gNodeB has to operate according to a same DRX cycle for successful downlink communications between the two. It would not be sufficient for (only) the UE to operate according to the DRX cycle. Then, the gNodeB would not know if a downlink communication was actually received by the UE. Thus, for successful downlink communications both the UE and the gNodeB need to be configured with the same DRX cycle. However, the gNodeB can be configured with multiple different DRX cycles, each corresponding to an individual UE.
  • bandwidth part adaptation As described before, in NR the concept of bandwidth part adaptation is introduced, exemplarily, for downlink communication between the gNodeB and the UE. Due to the bandwidth part adaptation, it becomes possible to further alleviate the reception requirements for downlink communications between the gNodeB and the UE. Namely by assuming the usage of narrow bandwidth part UE can skip monitoring the system bandwidth outside of the adapted narrow bandwidth part. Thus, this concept can also be employed for battery saving purposes.
  • the gNodeB has to operate according to a same adapted bandwidth part for successful downlink communications between the two. It would not be sufficient for (only) the UE to operate in an accordingly adapted bandwidth part. Then, the gNodeB would also not know if a downlink communication was actually received by the UE. Thus, for successful downlink communications, also here, the UE and the gNodeB need to have a common understanding with the same adapted bandwidth part. Nevertheless, gNodeB can operate on multiple bandwidth parts simultaneously, each for an individual UE.
  • the present disclosure combines both mechanisms to attain a maximum amount of battery saving while at the same time keeping the complexity of synchronizing both mechanisms at a minimum. It shall be emphasized that the combination of the two mechanisms reduces the reception requirements for the UE in time domain as well as frequency domain, thereby achieving a synergistic effect between the two.
  • the present disclosure does not stop at recognizing that both mechanisms can coexist in a mobile communication system. Rather, as part of the present disclosure it is recognized that there are specific combinations of bandwidth part usages advantageously combine with the individual communication periods of a DRC cycle. In this respect, a semi-static configuration of adapted bandwidth parts is suggested for at least one of the communication periods in a DRX cycle.
  • the UE as well as the gNodeB already knows (e.g. by way of semi-static configuration) which specific one of two distinct bandwidth parts can be advantageously used during the at least one communication period of the DRX cycle once the UE is configured by the gNodeB.
  • This knowledge in the UE shall however, not prevent the gNodeB from additionally controlling the usage of bandwidth parts dynamically.
  • the UE and the gNodeB can use for downlink communication in a mobile communication system at least one first, narrow bandwidth part BP1 or a second, wide bandwidth part BP2.
  • the UE and the gNodeB refer to particular usage combinations in the following table for the bandwidth part usage during the at least one communication period within a DRX cycle.
  • bandwidth part usage combinations are summarized in the following table.
  • neither one of the above indicated bandwidth part usage combinations restricts the downlink communication to the respective one of the first or second bandwidth part for the respective one of the communication periods of the DRX cycle. Rather, the gNodeB may still, in addition, control the use of the bandwidth parts dynamically.
  • Fig. 3a an example of two consecutive DRX cycles #N and #N+1 with no downlink data transmissions from the gNodeB to the UE. Irrespective thereof, for both DRX cycles the UE is configured with a "ON duration" timer with a timer value of 2 slots. Thus, the UE wakes up during time slots #0 and #1 of both DRX cycles #N and #N+1 to monitor the physical downlink control channel for potential downlink assignment.
  • the UE and the gNodeB are configured according to the fourth bandwidth part usage combination (short: fourth usage).
  • the UE monitors the physical downlink control channel in slots #0 and #1 of both DRX cycles #N and #N+1 using the first, narrow bandwidth part BP1.
  • This fourth bandwidth part usage combination attains a maximum battery saving effect for downlink communication between the gNodeB and the UE.
  • the fourth bandwidth part usage combination may be indicated by the gNodeB to the UE in advance, for example by way of a bandwidth usage indication, or may be indicated by the gNodeB to the UE at the same time of configuring the DRX cycle. In both cases, the UE already knows, when configuring the DRC cycle, which of the first or the second bandwidth parts it shall use during the individual communication periods of the DRX cycle.
  • the bandwidth usage indication may be included in a (dedicated) radio resource configuration, RRC, message.
  • the bandwidth indication may be included in the RRC message configuring the DRX cycle.
  • Further alternatives include a downlink control information, DCI, message or a Medium Access Control, MAC, Control Element.
  • the UE then monitors using the narrow bandwidth part, BP1, as specified for the second usage, (at least) as long as the "ON duration" timer is running the physical downlink control channel (PDCCH) for scheduling assignments (downlink resource allocations), namely for downlink control information (DCI) messages with a resource block (RB) assignment and a new data indicator (NDI) where the CRC is scrambled with the UE identity (i.e. a radio network temporary identifier (RNTI) of the UE, particularly the cell radio network temporary identifier (C-RNTI) of the UE).
  • RNTI radio network temporary identifier
  • C-RNTI cell radio network temporary identifier
  • the UE Having restricted the monitoring of the physical downlink control channel to the first, narrow bandwidth part, BP1, the UE benefits from a reduced power consumption.
  • the gNodeB has also to use for downlink communications the same first, narrow bandwidth part, BP1.
  • the UE goes in slot #2 back to sleep and continues to sleep for the remaining part of the DRX cycle #N.
  • the same behavior of the UE repeats for DRX cycle #N+1.
  • FIG. 3b an example of two consecutive DRX cycles #N and #N+1 is shown with downlink data transmissions from the gNodeB to the UE in DRX cycle #N and with no downlink data transmissions in DRX cycle #N+1.
  • the UE and the gNodeB are (again) configured according to the fourth bandwidth part usage combination (short: fourth usage).
  • the UE monitors the physical downlink control channel in slots #0 and #1 of both DRX cycles #N and #N+1 using the first, narrow bandwidth part BP1.
  • This fourth bandwidth part usage combination attains a maximum battery savings effect for downlink communication between the gNodeB and the UE.
  • the fourth bandwidth part usage combination may be indicated by the gNodeB to the UE in advance, for example by way of a bandwidth usage indication, or may be indicated by the gNodeB to the UE at the same time of configuring the DRX cycle.
  • the UE already knows, when configuring the DRC cycle, which of the first or the second bandwidth parts BP1 or BP2 it shall use during the individual communication periods of the DRX cycle.
  • the UE is controlled by the gNodeB so that it dynamically activates the second, wide bandwidth part for downlink data transmissions from the gNodeB.
  • the UE detects a scheduling assignment for a downlink data transmission to itself, then the UE activates for the downlink data transmission in the indicated RBs the second, wide bandwidth part, BP2.
  • This second, wide bandwidth part, BP2 then remains activated for the remaining slots of the TRANSMISSION duration.
  • the gNodeB utilizes for the (initial) downlink data transmissions the second, wide bandwidth part, BP2, to the UE, thereby maximizing throughput, whereas the UE can remain for monitoring purposes in the first, narrow bandwidth part, BP1, for battery saving purposes.
  • the dynamic activation of the second, wide bandwidth part, BP2, and the deactivation of the first, narrow bandwidth part, BP1 does not require any separate signaling, for example, included in the scheduling assignment received by the UE from the gNodeB. Rather, due to the fact that the UE activates the second, wide bandwidth part, BP2 in response to the detection of the (standard) scheduling assignment, it can use, without delay, the second, wide bandwidth part, BP2, for the indicated downlink data transmission.
  • the dynamic activation of the second, wide bandwidth part BP2 is advantageously limited to (remaining part of) the TRANSMISSION duration of only that DRX cycle.
  • the UE will start monitoring the physical downlink control channel with the first, narrow bandwidth part BP1.
  • the dynamic activation of the second, wide bandwidth part BP2 does not have any effect on the other communication periods of the same DRX cycle, namely the INACTIVE and the RETRANSMISSION duration.
  • the throughput for downlink communications between the gNodeB and the UE can be maximized, yet, retaining this effect for a short time frame only (i.e. the transmission period), and, at the same time, avoiding any complex signaling for the bandwidth part activation.
  • the UE wakes up in slot #0 and monitors the physical downlink control channel. In this slot #0 the UE does not detect a downlink assignment for the UE. Thus, for monitoring the physical downlink control channel in slot #0 the UE uses the first, narrow bandwidth part, BP1.
  • the UE When detecting, in slot #1, a scheduling assignment in the physical downlink control channel (e.g. downlink control information (DCI) message which includes a RB assignment for an initial transmission) for itself, the UE also dynamically activates the second, wide bandwidth part BP2.
  • DCI downlink control information
  • the activation time for activating the second, wide bandwidth part BP2 (and the deactivation of the first, narrow bandwidth part BP1) is sufficient for the UE to refer to the resource block(s) (RBs) indicated by the scheduling assignment in the physical downlink shared channel (PDSCH) and to receive the downlink data transmission in the indicated resource block(s).
  • the UE receives, in this slot #1, the scheduled downlink data transmission using the second, wide bandwidth part BP2. Having received a downlink data transmission, the UE proceed in slots #2 and #3 to also receive downlink data transmissions using the second, wide bandwidth part BP2. Thus, for the remainder of the TRANSMISSION duration, the UE remains in the second, wide bandwidth part BP2, thereby attaining maximum throughput in the downlink communication of the DRX cycle #N.
  • slot #4 Despite monitoring in slot #4 the physical downlink control channel, the UE does not receive a scheduling assignment. Thus, this slot #4 is considered part of the INACTIVE duration. Thus, for this slot #4 the UE activates the first, narrow bandwidth part, BP1, (and deactivates the second, wide bandwidth part BP2), as specified by the fourth bandwidth part usage combination. Thereby, the monitoring of the physical downlink control channel during the INACTIVE duration can be performed by the UE with a maximum battery saving effect. The UE remains in the first, narrow bandwidth part, BP1, for the (entire) INACTIVE duration, namely not only for slot #4 but also for slots #5 and #6.
  • the UE needs to wake-up for potential retransmissions during a RETRANSMISSION duration which is provided for should one of the (initial) downlink data transmissions have failed.
  • the RETRANSMISSION duration is separately configured for each (initial) downlink data transmission, e.g. per hybrid Automatic Repeat Request (HARQ) process.
  • HARQ hybrid Automatic Repeat Request
  • the UE again activates the first, narrow bandwidth part, BP1 (and deactivates the second, wide bandwidth part BP2) as specified by the fourth bandwidth part usage combination.
  • BP1 narrow bandwidth part
  • BP2 wide bandwidth part
  • the monitoring and receiving of downlink data retransmissions during the RETRANSMISSION can be performed by the UE with a maximum battery savings effect.
  • the RETRANSMISSION duration occurs after the INACTIVE duration, meaning that the traffic burst is close to the end. Therefore, using narrow bandwidth part, BP1, would be sufficient for gNodeB to deliver the possible data.
  • the fourth bandwidth part usage combination attains a maximum battery saving effect for downlink communication between the gNodeB and the UE.
  • the throughput for at least the (initial) downlink data transmissions can also be improved in the same DRX cycle. This advantageous combination does not even require any complex signaling, as discussed before.
  • FIGs. 3c and 3d further examples of two consecutive DRX cycles #N and #N+1 are shown with downlink data transmissions from the gNodeB to the UE in DRX cycle #N and with no downlink data transmissions in DRX cycle #N+1.
  • the UE and the gNodeB are configured according to the fourth bandwidth part usage combination (short: fourth usage), with additionally, a dynamic activation of the second, wide bandwidth part BP2 for downlink data transmissions during the TRANSMISSION duration.
  • fourth usage the fourth bandwidth part usage combination
  • a dynamic activation of the second, wide bandwidth part BP2 for downlink data transmissions during the TRANSMISSION duration results in a similar usage of the first and second bandwidth parts BP1 and BP2 as compared with the downlink communication in Fig. 3b .
  • a detailed description thereof is omitted herein for reasons of brevity.
  • the definition of the bandwidth part usage combinations always allows an unique identification of which specific one of the first or second bandwidth parts BP1 and BP2 are to be activated, namely during the TRANSMISSION, INACTIVE and RETRANSMISSION duration of the DRX cycle.
  • Figs. 4a- 4d further examples of two consecutive DRX cycles #N and #N+1 are shown with the gNodeB communicating (or not) in the downlink with the UE in the respective communication periods of the DRX cycle.
  • the UE and the gNodeB are configured according to the third bandwidth part usage combination (short: third usage), with additionally, a dynamic activation of the second, wide bandwidth part BP2 for downlink data transmissions during the TRANSMISSION duration of the DRX cycle.
  • the UE activates the first, narrow bandwidth part, BP1, at the start of the TRANSMISSION duration of the DRX cycles of all figures 4a- 4d . Then, as shown in figures 4b- 4d , the detection of a scheduling assignment in the physical downlink control channel results in the activation of the second, wide bandwidth part, BP2, and the usage thereof for downlink data transmissions. This second wide bandwidth part, BP2 remains activated for the remainder of the TRANSMISSION duration of the same DRX cycle.
  • the UE After completion of the downlink data transmissions (also no further scheduling assignment are detected), the UE assumes the INACTIVE duration and, for this purpose, in slot #4 in figure 4b , in slot #7 in figure 4c , or in slot #9 in figure 4d the first, narrow bandwidth part, BP1 is activated. This again complies with what is specified by the third bandwidth part usage combination.
  • the UE activates again the second, wide bandwidth part, BP2, for monitoring the physical downlink control channel and for potentially receiving downlink data retransmissions over the physical downlink shared channel. Due to the usage of the second, wide bandwidth part, BP2, a higher reliability for the downlink data retransmissions can be achieved, since the gNodeB has more freedom in the frequency domain to schedule the resources for retransmission which can bring lower code rate or/and better diversity Also with the usage of the second, wide bandwidth part, BP2, the UE favorably uses also the same bandwidth part for the downlink data retransmissions as for the (initial) downlink data transmission. However, the power consumption could slightly increase, compared to the fourth usage as described before.
  • the UE dynamically activates the second, wide bandwidth part, BP2, when it detects, during the RETRANSMISSION duration, a scheduling assignment indicating a downlink data retransmission for a corresponding (initial) transmission (e.g. via the HARQ information in the downlink control information, DCI, message). Then, the UE receives from the gNodeB the downlink data retransmission using the activated second, wide bandwidth part, BP2.
  • the gNodeB may be more flexible in selecting resource block(s) to the scheduling assignment for the downlink data retransmission. This flexibility may result in further improvements to the reliability during the RETRANSMISSION duration, particularly if the gNodeB has to cope with higher number of transmission failures.
  • the UE dynamically activates the same bandwidth part (e.g. BP1 or BP2) to be used for the downlink data retransmissions as in the (initial) downlink data transmission.
  • This mechanism assumes that an (initial) downlink data transmission between the gNodeB and the UE has failed during the TRANSMISSION duration, and that the UE detects, during the RETRANSMISSION duration, a scheduling assignment for the according retransmission. Then, in this mechanism, the UE activates the same one of the bandwidth parts (BP1 or BP2) which was also used for the (initial) downlink data transmission.
  • Such a dynamic activation pattern may be advantageous if gNodeB wants to ensure that it has the same bandwidth part at its disposal for the (initial) transmission as well as for the retransmission. If, one the one hand, the gNodeB does attribute a low priority to the (initial) transmissions to the UE, it may hereby also ensure that the retransmissions are also handled with a same low priority. If, on the other hand, the gNodeB does attribute a high priority to the (initial) transmission to the UE, then same holds true also for the retransmissions.
  • the gNodeB can enforce a same level of priority upon both transmissions even when variably combining this mechanism with changing bandwidth part usage combinations. Also the same level of priority can be enforced if the dynamic activation of the second, wide bandwidth part, BP2, is frequently changed.
  • the DCI message carrying scheduling assignment itself can be used as the trigger for dynamic bandwidth part switching. Therefore, no additional bit field in DCI is needed to explicitly indicate the bandwidth part switching.
  • the gNodeB transmits to the UE in form of a downlink control information (DCI) message including an instruction to activate a specific bandwidth part (BP1 or BP2) for the (entire duration) of a communication period of the DRX cycle.
  • DCI downlink control information
  • This may be realized by transmitting the DCI message in advance of the respective communication period being one of the TRANSMISSION period, the INACTIVE period, and the RETRANSMISSION period.
  • a dedicated bit field in DCI to indicate the activated bandwidth part is needed.
  • the additional advantage of have the dedicated bit field in DCI is to facilitate the bandwidth part indication if multiple wide and narrow bandwidth parts are configured for the UE.
  • the activated one can be indicated by, e.g., bandwidth part index.
  • the UE In response to the reception of the DCI message, the UE then configures the downlink communication with the gNodeB during the indicated communication period of the DRX cycle to use the instructed bandwidth part (BP1 or BP2).
  • the instructed bandwidth part BP1 or BP2.
  • the mechanism can even result in the dynamic activation of an instructed bandwidth part (BP1 or BP2) for the entire duration of a communication period of the DRX cycle.
  • This is not possible with the other dynamic activation mechanisms which are all activating the respective bandwidth part only on demand, i.e. upon reception of a scheduling assignment.
  • this mechanism could complement the first to fourth bandwidth part usage combinations in an advantageous manner, for example in case of instantaneous traffic demands.
  • UE and gNodeB should have a common understanding of which one of the above three mechanisms is currently used. This common understanding can be established, e.g., by RRC signaling from gNodeB to UE.
  • the first to fourth bandwidth part usage combinations have different advantages, and are intended for different scenarios. Yet, they all have in common that either one of the first to fourth bandwidth part usage combinations specifies which of the first or second bandwidth part, BP1 or BP2, is to be used in all the different communication periods during the DRX cycle. In other words, either one of the first to fourth bandwidth usage combinations can be used for all different communication timings of the DRX cycle.
  • the first to fourth bandwidth usage combinations can readily result in a common understanding between the UE and the gNodeB which of the first or second bandwidth part, BP1 or BP2 is to be used during the entire DRX cycle.
  • the first to fourth bandwidth usage combinations attain the advantageous effect that the UE can receive downlink communications during at least one, more particularly during all communication periods of the DRX cycle to use a specific one of the first and second bandwidth parts BP1 or BP2.
  • the first to fourth bandwidth usage combination is indicated semi-statically from the gNodeB to the UE, for instance, in a (dedicated) radio resource configuration, RRC, message.
  • the bandwidth indication may be included in the RRC message configuring the DRX cycle.
  • Further alternatives include a downlink control information, DCI, message or a Medium Access Control, MAC, Control Element.
  • the first to fourth bandwidth usage combinations may also be specified in a suitable section in 3GPP technical standard of NR, such that the indication from the gNodeB to the UE only includes a reference to the one of the first to fourth bandwidth usage combinations. This could be achieved by, as few as two bits, provided that both the gNodeB and the UE have a common understanding about which of the first to fourth bandwidth usage combinations is to be used.
  • the 3GPP technical standard specifications can specify the relation between one of the four bandwidth usages with the UE category and/or service scenario. With such relationship, UEs belonging to one particular category and/or in a particular deployment scenario follow one particular bandwidth usage combination. In such way, the signaling overhead for configuration vanishes.
  • the first to fourth bandwidth usage combinations could be extended in that indication thereof requires further information what the first, narrow bandwidth part, BP1, and what the second, wide bandwidth part, BP2, are. This is necessary, particularly, in a mobile communication system where multiple narrow bandwidth parts, and multiple wide bandwidth parts can are configured over the system bandwidth.
  • the further information must complement the first to fourth bandwidth usage combinations such that it knows which of the configured different narrow and wide bandwidth parts to use as the first and second bandwidth part BP1 and BP2 of the first to fourth bandwidth usage combinations.
  • This further information can, for example, be signaled from the gNodeB to the UE in form of a downlink control information (DCI) message.
  • DCI downlink control information
  • the signaling DCI message may include an index to select the first and/or second bandwidth part BP1, BP2 from among a plurality of non-overlapping or overlapping narrow and wide bandwidth parts within the system bandwidth.
  • the semi-statically configured first to fourth bandwidth part usage combinations are also suitable for this configuration of the mobile communication system.
  • the first bandwidth part usage combination (short: first usage) always use wide bandwidth part, BP2, at the beginning of a DRX cycle.
  • This facilitates the possible beam management procedure because wide bandwidth part can be used for better beam measurement accuracy.
  • the first bandwidth part usage also features no bandwidth part switching over the whole communication period in a DRX cycle. This gives the advantage of eliminating the bandwidth transition overhead.
  • the first bandwidth part usage can be used when traffic characteristics are completed known and the DRX cycle is configured accurately.
  • UE always activates narrow bandwidth part, BP1, when wakes up at each DRX cycle. This can reduce the power consumption when UE wakes up unnecessarily. Therefore, the configuration of DRX cycle and OnDuration timer can be more relaxed, compared to the first usage.
  • the second bandwidth part usage combination (short: second usage) only allows narrow to wide bandwidth part switching once a scheduling assignment is detected (e.g., by a dynamic mechanism) and then maintains the wide bandwidth part for the rest of the DRX cycle. Since the wide bandwidth part can increase the peak data rate, such that the burst traffic can be served more quickly. This allows UE to get back to sleep earlier. Having a wide bandwidth part during the other time periods, such as INACTIVE time, can also provide more scheduling flexibility for the gNodeB. However, compared to the first usage, this second usage slightly increases the bandwidth part switching overhead. Nevertheless, it can beneficially be used, when traffic characteristics are not completely, but largely known.
  • the third bandwidth part usage combination (short: third usage) prioritizes the retransmissions over or same as the (initial) transmissions, depending on which dynamic mechanism is used for bandwidth part activation once the scheduling assignment is detected during TRANSMISSION duration. Therefore, it provides reliable retransmission and makes efficient use of the bandwidth at high traffic loads.
  • the fourth bandwidth part usage combination (short: fourth usage) allows more bandwidth part switching to achieve better power saving, however, at the cost of an increased switching (transition) overhead. It can be beneficially applied when the traffic characteristics are unknown and hence DRX configuration cannot be configured matching the traffic burst. With the help of the fourth bandwidth part usage, the power saving gain can still be achieved.
  • the present disclosure can be realized by software, hardware, or software in cooperation with hardware.
  • Each functional block used in the description of each embodiment described above can be partly or entirely realized by an LSI such as an integrated circuit, and each process described in the each embodiment may be controlled partly or entirely by the same LSI or a combination of LSIs.
  • the LSI may be individually formed as chips, or one chip may be formed so as to include a part or all of the functional blocks.
  • the LSI may include a data input and output coupled thereto.
  • the LSI here may be referred to as an IC, a system LSI, a super LSI, or an ultra LSI depending on a difference in the degree of integration.
  • the technique of implementing an integrated circuit is not limited to the LSI and may be realized by using a dedicated circuit, a general-purpose processor, or a special-purpose processor.
  • a FPGA Field Programmable Gate Array
  • a reconfigurable processor in which the connections and the settings of circuit cells disposed inside the LSI can be reconfigured may be used.
  • the present disclosure can be realized as digital processing or analogue processing. If future integrated circuit technology replaces LSIs as a result of the advancement of semiconductor technology or other derivative technology, the functional blocks could be integrated using the future integrated circuit technology. Biotechnology can also be applied.
  • a mobile terminal for communicating in a mobile communication system with a base station using at least one of a first bandwidth part and a second bandwidth part within a system bandwidth, the first bandwidth part being smaller than the second bandwidth part.
  • the mobile terminal comprises a transceiver which, in operation, receives a configuration of a discontinuous reception, DRX, cycle; and a processor which, in operation, configures, upon reception of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part, and the second bandwidth part.
  • the processor of the mobile terminal in operation, configures the downlink communication according to a bandwidth usage indication which indicates a usage of the specific one of at least the first and second bandwidth part during the at least one of the communication period within the DRX cycle.
  • the transceiver of the mobile terminal in operation, receives the bandwidth usage indication via a radio resource configuration, RRC, message, a Downlink Control Information, DCI, message or a Medium Access Control, MAC, Control Element.
  • the transceiver of the mobile terminal in operation, receives the bandwidth usage indication in a message also including the configuration of the DRX cycle.
  • the bandwidth usage indication indicates a usage of the specific one of at least the first and second bandwidth part during at least a TRANSMISSION duration, an INACTIVE duration, and an RETRANSMISSION duration within the DRX cycle and/or wherein the bandwidth usage indication indicates either a first usage including the second bandwidth part during the TRANSMISSION duration, the second bandwidth part during the INACTIVE duration, and the second bandwidth part during the RETRANSMISSION duration within the DRX cycle; or a second usage including the first bandwidth part during the TRANSMISSION duration, the second bandwidth part during the INACTIVE duration, and the second bandwidth part during the RETRANSMISSION duration within the DRX cycle; or a third usage including the first bandwidth part during the TRANSMISSION duration, the first bandwidth part during the INACTIVE duration, and the second bandwidth part during the RETRANSMISSION duration within the DRX cycle; or a forth usage including the first bandwidth part during the TRANSMISSION duration, the first bandwidth part during the TRANSMISSION duration, the first bandwidth part during the first bandwidth part during the
  • the processor of the mobile terminal in operation, respectively configures the downlink communication during the TRANSMISSION duration or RETRANSMISSION duration to use the second bandwidth part in case the transceiver receives a downlink scheduling assignment for a downlink transmission or re-transmission,
  • the processor of the mobile terminal in operation, configures the communication during the RETRANSMISSION duration to use the same of the first and second bandwidth part, as for the downlink communication of the corresponding transmission during the TRANSMISSION duration, in case the transceiver receives a downlink scheduling assignment for a downlink re-transmission.
  • the processor of the mobile terminal in operation, configures the communication during the corresponding of the at least one of the communication periods within the DRX cycle to use instructed specific one of at least the first bandwidth part and the second bandwidth part , in case the transceiver receives a Downlink Control Information, DCI, message including an instruction to activate the specific one of at least the first bandwidth part and the second bandwidth part during at least one of the communication periods within the DRX cycle.
  • DCI Downlink Control Information
  • the transceiver of the mobile terminal in operation, receives a configuration message, optionally a Downlink Control Information, DCI, message including: an index to select the first and/or second bandwidth part from among a plurality of non-overlapping or overlapping narrow and wide bandwidth parts within the system bandwidth.
  • DCI Downlink Control Information
  • a base station for communicating in a mobile communication system with a mobile terminal , using at least one of a first bandwidth part , and a second bandwidth part within a system bandwidth, the first bandwidth part being smaller than the second bandwidth part.
  • the base station comprises a transceiver which, in operation, transmits a configuration of a discontinuous reception, DRX, cycle; and a processor which, in operation, configures, upon transmission of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part, and the second bandwidth part.
  • the processor of the base station in operation, configures the downlink communication according to a bandwidth usage indication which indicates a usage of the specific one of at least the first and second bandwidth part during the at least one of the communication period within the DRX cycle.
  • the transceiver of the base station in operation, transmits the bandwidth usage indication via a radio resource configuration, RRC, message, a Downlink Control Information, DCI, message or a Medium Access Control, MAC, Control Element.
  • the transceiver of the base station in operation, transmits the bandwidth usage indication in a message also including the configuration of the DRX cycle.
  • the bandwidth usage indication indicates a usage of the specific one of at least the first and second bandwidth part during at least a TRANSMISSION duration, an INACTIVE duration, and an RETRANSMISSION duration within the DRX cycle and/or wherein the bandwidth usage indication indicates either a first usage including the second bandwidth part during the TRANSMISSION duration, the second bandwidth part during the INACTIVE duration, and the second bandwidth part during the RETRANSMISSION duration within the DRX cycle; or a second usage including the first bandwidth part during the TRANSMISSION duration, the second bandwidth part during the INACTIVE duration, and the second bandwidth part during the RETRANSMISSION duration within the DRX cycle; or a third usage including the first bandwidth part during the TRANSMISSION duration, the first bandwidth part during the INACTIVE duration, and the second bandwidth part during the RETRANSMISSION duration within the DRX cycle; or a forth usage including the first bandwidth part during the TRANSMISSION duration, the first bandwidth
  • the processor of the base station in operation, respectively configures the downlink communication during the TRANSMISSION duration or RETRANSMISSION duration to use the second bandwidth part , in case the transceiver transmits a downlink scheduling assignment for a downlink transmission or re-transmission.
  • the processor of the base station in operation, configures the communication during the RETRANSMISSION duration to use the same of the first and second bandwidth part, as for the downlink communication of the corresponding transmission during the TRANSMISSION duration, in case the transceiver transmits a downlink scheduling assignment for a downlink re-transmission.
  • the processor of the base station in operation, configures the communication during the corresponding of the at least one of the communication periods within the DRX cycle to use instructed specific one of at least the first bandwidth part and the second bandwidth part, in case the transceiver transmits a Downlink Control Information, DCI, message including an instruction to activate the specific one of at least the first bandwidth part and the second bandwidth part during at least one of the communication periods within the DRX cycle.
  • DCI Downlink Control Information
  • the transceiver of the base station in operation, transmits a configuration message, optionally a Downlink Control Information, DCI, message including: an index to select the first and/or second bandwidth part from among a plurality of non-overlapping or overlapping narrow and wide bandwidth parts within the system bandwidth.
  • DCI Downlink Control Information
  • an operating method for a mobile terminal is suggested to communicate in a mobile communication system with a base station using at least one of a first bandwidth part , and a second bandwidth part within a system bandwidth, the first bandwidth part being smaller than the second bandwidth part .
  • the method comprises the steps of receiving a configuration of a discontinuous reception, DRX, cycle; and configuring, upon reception of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part and the second bandwidth part.
  • an operating method for a base station is suggested to communicate in a mobile communication system with a mobile terminal, using at least one of a first bandwidth part , and a second bandwidth part within a system bandwidth, the first bandwidth part being smaller than the second bandwidth part .
  • the method comprises the steps of transmitting a configuration of a discontinuous reception, DRX, cycle; and configuring, upon transmission of the configuration of the DRX cycle, a downlink communication during at least one of the communication periods within the DRX cycle to use a specific one of at least the first bandwidth part, and the second bandwidth part.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Control Of Combustion (AREA)
EP17186074.5A 2017-08-11 2017-08-11 Bandbreitenteilanpassung in downlink-kommunikation Withdrawn EP3442148A1 (de)

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EP17186074.5A EP3442148A1 (de) 2017-08-11 2017-08-11 Bandbreitenteilanpassung in downlink-kommunikation
JP2020503744A JP7378387B2 (ja) 2017-08-11 2018-08-09 ダウンリンク通信における帯域幅部分の適合化
EP22213581.6A EP4175214A1 (de) 2017-08-11 2018-08-09 Bandbreitenteilanpassung in der downlink-kommunikation
PL18749401.8T PL3665822T3 (pl) 2017-08-11 2018-08-09 Dostosowywanie części szerokości pasma w komunikacji łącza w dół
BR112020002544-5A BR112020002544A2 (pt) 2017-08-11 2018-08-09 terminal móvel para comunicação, estação-base para comunicação, método de operação para um terminal móvel para se comunicar, método de operação para uma estação-base para se comunicar, circuito integrado que controla um processo de um terminal móvel para se comunicar e circuito integrado que controla um processo de uma estação-base para se comunicar
MX2020001617A MX2020001617A (es) 2017-08-11 2018-08-09 Adaptacion de parte de ancho de banda en comunicaciones de enlace descendente.
KR1020207007029A KR102501220B1 (ko) 2017-08-11 2018-08-09 다운링크 통신에서의 대역폭 부분 적응
CN202210857915.9A CN115412215B (zh) 2017-08-11 2018-08-09 下行链路通信中的带宽部分适配的方法、移动终端和基站
RU2020103886A RU2763778C2 (ru) 2017-08-11 2018-08-09 Адаптация части полосы пропускания на нисходящей линии связи
PCT/EP2018/071653 WO2019030335A1 (en) 2017-08-11 2018-08-09 ADAPTATION OF BANDWIDTH PART IN DOWNLINK COMMUNICATIONS
ES18749401T ES2945965T3 (es) 2017-08-11 2018-08-09 Adaptación de parte de ancho de banda en comunicaciones de enlace descendente
EP18749401.8A EP3665822B1 (de) 2017-08-11 2018-08-09 Bandbreitenteilanpassung in downlink-kommunikation
CA3071213A CA3071213A1 (en) 2017-08-11 2018-08-09 Bandwidth part adaptation in downlink communications
CN201880052155.6A CN111034102B (zh) 2017-08-11 2018-08-09 下行链路通信中的带宽部分适配的方法、移动终端和基站
CONC2020/0001172A CO2020001172A2 (es) 2017-08-11 2020-01-31 Adaptación de parte de ancho de banda en comunicaciones de enlace descendente
US16/786,746 US11265961B2 (en) 2017-08-11 2020-02-10 Bandwidth part adaptation in downlink communications
US17/579,493 US11659618B2 (en) 2017-08-11 2022-01-19 Bandwidth part adaptation in downlink communications
US18/299,465 US12022561B2 (en) 2017-08-11 2023-04-12 Bandwidth part adaptation in downlink communications
US18/673,129 US20240324064A1 (en) 2017-08-11 2024-05-23 Bandwidth part adaptation in downlink communications

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